Multi- spectroscopy...
Transcript of Multi- spectroscopy...
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● Using VO standards and models● Science cases - SEDs from radio to Xray- Stellar IMFs, Gould Belt etc.- Obscured AGN and starbursts in GOODS
● Are data and tools available?● Can you find them?
● Handling radio data● Spectral cubes● Polarization
● High-resolution radio maser spectra● Megamasers as magnetic & kinematic
probes● Summary
Multi-Multi- spectroscopy requirements spectroscopy requirements
Anita Richards with thanks to AstroGrid, IVOA & RadioNet
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Science casesScience cases● Identifying massive young stars
● IMF (VOTech), Gould Belt (AstroGrid)● Data: UV-optical-IR-radio photometry, IR-mm lines- Waveband, resolution, sensitivity limits/saturation- Accuracy
● Models: SVO, Mocassin ● Tools- Astrometry- Convert to physical units, find eff, dereddening- Fit data to models - YAFIT- Identifying lines (interactive only)
● Obscured AGN and starbursts in GOODS● Identify obscured AGN/QSO Padovani et al. 04 - Similar requirements + X-ray (not yet counts>flux)
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Science casesScience cases● Identifying massive young stars
● IMF (VOTech), Gould Belt (AstroGrid)● Data: UV-optical-IR-radio photometry, IR-mm lines- Waveband, resolution, sensitivity limits/saturation- Accuracy
● Models: SVO, Mocassin ● Tools- Astrometry- Convert to physical units, find eff, dereddening- Fit data to models - YAFIT- Identifying lines (interactive only)
● Obscured AGN and starbursts in GOODS● Identify obscured AGN/QSO Padovani et al. 04 - Similar requirements + X-ray (not yet counts>flux)
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● 18 X-ray-selected AGN2 have radio counterparts, 11 are radio starbursts (Richards et al '07 in prep)● GOODS images and catalogues (HST, Chandra)- Cross-matching, astrometry
● Spitzer format issues● Redshifts from literature, Team Keck● Classify morphologies● Radio source extractor/cutout server under dev.● Make luminosities, spectral/photon indices ● Full radio-IR-X-ray fitting to SEDs- Classification- Redshift estimation
High-z radio starbursts in HDF(N) High-z radio starbursts in HDF(N)
host obscured AGNhost obscured AGN
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● 18 X-ray-selected AGN2 have radio counterparts, 11 are radio starbursts (Richards et al '07 in prep)● GOODS images and catalogues (HST, Chandra)- Cross-matching, astrometry
● Spitzer format issues● Redshifts from literature, Team Keck● Classify morphologies● Radio source extractor/cutout server under dev.● Make luminosities, spectral/photon indices ● Full radio-IR-X-ray fitting to SEDs- Classification- Redshift estimation
High-z radio starbursts in HDF(N) High-z radio starbursts in HDF(N)
host obscured AGNhost obscured AGN
x-ray optical radio
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● IVOA Registry standards and schema● Data collections● Tools and services
● URL, nature of service● Contact person
● Data Coverage● Any limits on No. objects etc.● Data quality/calibration state self-score● Model is fine for data, just not used properly!
● Description of tools is weaker● Most fields often left blank
● Is model too complex?● Are curators unaware of problems?- Lack of imagination that potential use is so wide?
Finding tools and dataFinding tools and data
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VO VO
ExplorerExplorer
● AstroGrid workbench
● Only as good as the metadata!
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Spectrum, Char etc. modelsSpectrum, Char etc. models
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Spectrum, Char etc. modelsSpectrum, Char etc. models● Data models for complex re-
lationships, detailed descrip-tions, uncertainties etc.
● Used by VO experts ● Scare small archives/tool de-
velopers?● Stress heirachical structure
● Start with simple description● Add detail as required
● Need tools to fill in/validate● FITS header extracters e.g.
VOQuest, AstroGrid tool● New Char tool CAMEA● DB data (including obs/
image/spectrum logs)?
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Spectrum, Char etc. modelsSpectrum, Char etc. models● Data models for complex re-
lationships, detailed descrip-tions, uncertainties etc.
● Used by VO experts ● Scare small archives/tool de-
velopers?● Stress heirachical structure
● Start with simple description● Add detail as required
● Need tools to fill in/validate● FITS header extracters e.g.
VOQuest, AstroGrid tool● New Char tool CAMEA● DB data (including obs/
image/spectrum logs)?
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Data model MKN 273 @ 18 cmData model MKN 273 @ 18 cm
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Data model MKN 273 @ 18 cmData model MKN 273 @ 18 cm
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● Also need ● Line rest frequencies - e.g. 1665.359, 1667.402 MHz
● Reference , inferred velocity, convention- e.g. 1600.125 MHz, 12370 km/s, radio VLSR
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OH megamaser polarizationOH megamaser polarization
● Ultra-sensitive, very high -resolution Arecibo spectra● Needed to measure Zeeman splitting ~10 kHz● Masing region unresolved in arcmin beam
● Compare with high spatial resolution interferometry● 125 kHz, total intensity, milli-arcsec beam
● Gaussian decomposition of spectrum wrt spatial fea-tures (Robishaw & Heiles 2007)● Typical magnetic field 3 mG in ULIRGS so far- Constrain equipartition- Contrast Starburst & Milky Way star formation
● Need published interferometric data for more sources!
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OH megamaser polarizationOH megamaser polarization
● Ultra-sensitive, very high -resolution Arecibo spectra● Needed to measure Zeeman splitting ~10 kHz● Masing region unresolved in arcmin beam
● Compare with high spatial resolution interferometry● 125 kHz, total intensity, milli-arcsec beam
● Gaussian decomposition of spectrum wrt spatial fea-tures (Robishaw & Heiles 2007)● Typical magnetic field 3 mG in ULIRGS so far- Constrain equipartition- Contrast Starburst & Milky Way star formation
● Need published interferometric data for more sources!
Examples of Arecibo
OH megamasers
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OH megamaser spatial distributionOH megamaser spatial distribution
Identify spectral and spatial
peaks in interferometric cube
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Decompose Decompose
spectrumspectrum
Markarian 273
MERLIN spectrum
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More NGC 4258'sMore NGC 4258's
● H2O maser proper motions● Sub-pc Keplerian disc● Constrains distance, BH mass
● New candidates (Braatz 07)● Full interpretation uses
masers as probes of kin-ematics and environment
● Also need multi- continuum (radio VLBI, HST, Spitzer...) to investigate cause of warps, accretion-jet ejection relation (BH feeding) etc. etc.
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Datacube manipulationDatacube manipulation● Aladin good for viewing● GAIA more quantitative● No VO tool understands
Jy/beam yet● Want to extract spectra,
make moments, spectral index maps etc.
● VO interface to specialised software cf MERLINImager
● Interface in astronomical terms
● Position, freq. resolution etc.● Not AIPS jargon!
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Datacube manipulationDatacube manipulation● Aladin good for viewing● GAIA more quantitative● No VO tool understands
Jy/beam yet● Want to extract spectra,
make moments, spectral index maps etc.
● VO interface to specialised software cf MERLINImager
● Interface in astronomical terms
● Position, freq. resolution etc.● Not AIPS jargon!
● AstroGrid CEA passes parameters to archive ser-vice
● RadioNet parselTongue (py-thon-based) finds data, runs appropriate software to make data products
● AstroGrid manages data flow
● SSA/SIAP-like list of products & metadata re-turned to user
● Bulky data only moved when needed
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● Gathering information on RadioNet for DCA census● LEDA (incl. Nancay) - some VO available● Efflesberg/Bonn - some own web services● Many single-dish archives - need calibration etc.
● Arecibo, Puschino, NRAO, ATNF, Nobeyama...● Dedicated surveys e.g. Methanol
● Torun and other blind surveys - extracted parameters may be in literature
● JBO/Parkes MMB survey committed to VO publication (also CORNISH 5-GHz continuum) - GLIMPSE area
● Cubes:● HIPASS/HIJASS - ongoing● MERLIN, EVN, VLA pipelines will eventually do line data
● Need appropriate tools and interfaces
Radio surveys (very incomplete list)Radio surveys (very incomplete list)
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● Development of standards should be use-driven● Provide simple levels, make complexity optional- Try for all appropriate data with minimum selection of wave-
band (radio, mm, IR, optical etc.) - resolution desirable for spectra...- Full passband, photometry nice but don't hang up!
● Improve tool descriptions- Allow automated/workflow use
● Model should include (optional!) polarization, Jy/beam ...● Specialised data handling best done at archives
● Must give non-experts at least some calibrated data● Provide VO interfaces- e.g. remote user-steered non-jargon pipelines- Minimise moving massive datasets
● Results: from finding proto-planets to measuring BHs
Summary and proposalsSummary and proposals